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Question

A glass tube of radius 0.8 cm floats vertical in water. What mass of lead pellets would cause the tube to sink a further 3 cm?

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Solution

Extra weight=extra upthrust on extra immersed volume.
(Δm)g=(πr2Δh)ρwg
Δm=πr2Δhρw
=(π)(0.8)2(3)(1)
=6.03 g

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